The Microsoft Web Platform Installer is a free tool that makes it
simple to download and install the latest components of the Microsoft
Web Platform, including the IIS, SQL Server Express, .NET Framework and
Visual Web Developer.
Developers and server administrators can use the Web Platform
Installer 1.0 to more easily discover, download and install the
Microsoft Web platform. Using the Web Platform Installer’s simple user
interface, you can select specific components or install the entire
Microsoft Web Platform onto your computer easily and quickly. To help
you stay up-to-date with product releases, the Web Platform Installer
tool always contains the most current versions and new additions to the
Microsoft Web Platform.
Examples of products which can be downloaded and installed through Web Platform Installer include:

• IIS Web Server
  
• Visual Web Developer 2008 Express Edition
  
• SQL Server Express Edition
  
• .NET Framework
  
• IIS Extensions (such as FTP 7.0 and URL Rewriter)
  
• …and more
  

Web Platform Installer x86 | x64